Method of making projectile-bands.



A. Wi UMNT.

METHOD Gf MAKING PROHCTILE BAM APPLICATEH FJLED FEE. 20, IW?.

Patented Juy 3,0, 1918,

,lvl Y 1 ,274, 359. nimma July sa 1918.

4 SHiSgSHFET 44 UNITED STATES PATENT OFFICE.

yaLExANIiEn W. LIMoN-r, or BRIDCEPCRT, CCNNECTICUT, AssIGNon To BEIDCEPCRT .BRASS CoMrANY, or BRIDGEPCRT, CONNECTICUT, A CORPORATION or CONNECTICUT.

METHOD OF MAKING PROJECTILE-BANDS.

Original application tiled November 5,

To all whom it may concern Be it known that I, ALEXANDER iV. L1- MoNT, a citizen of the United States, residing in Bridgeport, county of Fairfield, and State of Connecticut, have invented certain new and useful Improvements in Methods of Making Projectile-Bands, of which the following is a full, clear, and exact description.

This invention relates to a new method for manufacture of copper or other metallic bands for projectiles, such as shrapnel. This application is a division of my application` Serial No. 59,810, filed November 5th, 1915.

4In making' projectile bands. the practice now. followed is to draw .a seamless tube to 'the proper size from a solid billet or a east tubular shell, and then to place the tube in a suitable cutting off machine which cuts rings or bands therefrom. one or more at a time. p

r One of the primary objects of the present invention is to provide a method which is much more simple. accurate and economical than thatJ just mentioned.

A further object of the invention is to furnish a new method whereby rings or bands of the required dimensions can he formed ver)v ouicklv and accurately in large quantities by a series of very simple operations.

To these and other ends. the invention consists in the novel steps and procedure to he hereinafter described and claimed.

In the accompanying drawing.

Figure l1 is a fragmentary elevation. partly in section. of a press used in carrying out my new methodxshowing the commencement of the operation;

Fig. 2 is a similar view, showing a later stage of the operation;

Fig. 3 is an enlarged detail view of the blankf,"

Fig. -1 is asimilar view of the band;

Figs. and (i are sectional elevations of another type of press which can be used; and

Fig. 7 is a sectional elevation on a smaller scale of a press for performing' an operation subsequent to that shown in Figs. 5 and 6. A

Referring -to the drawing, and more particularly t0 Figs. l4 inclusive, I use a Specication of Letters Patent.

Patented July 30, 1918.

blank 10 (Fig. 3) which is in the form of Va washer of suitable size cut out of a flat vPigs. l. and 2, in which it is drawn to form the bami` and the band is ,given the required internal and efternal diameter. In the forni shown` the press is constructed as follows: A d rawing' die 11. mounted in a suitable bed plate 12. is provided with a cylindrical mouth portion l?) to receive the washer 10. and b elow the cvlindrical mouth portion 13; the` die is provided with a cylindrical wall llbfless diameter, the portions` lf3 and 14 being joined h v an eas)v curve or fillet. (uided vertically in the die opening is .1 c vlindrical sizing' sleeve 15. whose efternal diameter corresponds to that of the finished band. and whose internal diameter likewise corresponds to that of the finished hand. The outer surface of this' sleeve 15 is adapted to slide in close contact with the surface l-l. ihove the die 1l is a cvlimlrical drawing punch 1G mounted on a suitable cross head or gate lfr on the press: VThe external diameter of this drawin;r punch corresponds to the internal diruncter ot' the finished hand. and it is adapted lo dran the blank 1t) in the recess 1f. and to then enter thc .sleeve 1f. Surrounding the drawing punch 1V is a second sizing sleeve 1T corresponding to the sleeve 15. In the form -shown` this sleeve 1T is formed integral with a cross head 1H. mounted on rods 19 which support the sizing' sleeve 13 bv means of the plate Q() and lifter pins 2l. .\t a suitable point in the downward travel oi the punch lo. the cross head 1S and sleeve 1i' are depressed hv 'the abutment of the cross head 1G" auaiust the cross hcad'lfs which causes the sizingsleeve 15 to descend in the driuvinglr die.

'hcn the blank l() has been placed in the drawing die in the manner .shown in Fig. 1. the ,L'atc 1Gu of the press is' caused to descend, and thc punch l() engages the inner part of the hlank and disphu-cs the metal in such inner portion in an outward direction and draws the blank down against the surface 14 .so as to form it into a band 10, as shown in Fig. 2. This roughlv formed band has its inner and outer swf-.u ls substantially parallel to cach other throughout u and around .the punch 26 is a d'1e`28.4 The" the axial Vsection of the band, andthe edges of the band are substantially flat and at right angies to the inner and outer surffxcesA After the baud has been formed tfo its approximate final shape in the drawing die by the punch, it is subjected to erasure to perfect the saine, and bring both the internal and external dimensie!ny accurately to the required size. This is etti-vieil by the sizing sleeves 15, 1T, as shown more particu larly in Fig. Before the press gate reaches the limit of its downward monument, the internal surface of the hand is supported against the punch7 the external surface is supported againstv the surface l1 oi the die and the bottom .surface rests on the up per edge of the sleeve 15, which sleeve in this position of the parts is rigidi)v supported from the bottom by a portion l5 of the bed plate. The upper edge of the hand is contacted b v the lower edge of the sizing sleeve 1T. and as said sleeve is now sub jected to heav)Y downward pressure, the band is highly compressed and caused to completelyv fill the space between the punch and die. During this operation. the punch acts as a sort of mandrel for the blank. In this manner, the band can be very accurately made as regards both internal and external diameter which. ot' course, is a matter of great importance.

On the upstroke, of the press, the punch 16 carries upward the cross head 1S and sleeve 17, by enga ement of a shoulder 1Gh on the punch witi a shoulder 18 on the cross head, and the sleeve 1,5 is raised by the lifter pins 21, so as to eject the finished band from the die in an obvious'manner.

In Figs. 5, 6 and 7, l show another apparatus for carrying out the improved method. This apparatus comprises two sets o f dies, one for drawing the blank, and the other for sizing the same. In Fig. 5, the washer 10' is drawn in a die 22 by means of a punch 23 having a shoulder 24. scends, the blank isd'rawn b v the reduced lower end of the punch and takes up against the shoulder 21. On the upstroke of the punch, the band isstripped from the latter by the lower edge 25 of the die. The stripping of the band by the die 22 is due to the fact that when the pressure upon the'outer surface of the band is lremoved; the band expands slightly, thus preventing yit from passing throu dh the 'die 22 as the punch 23 moves .upward The blank then falls out of the die, through the bottom thereof, and

is placed in anothenpress of the type shown in Fig. 7. This press has a fixed sizing punch orniandrel '2G/on the bed plate'27,

As the punch de-` internal diameter of thefrie opening'corre-V 'spondsyto the external diameter of the fin- .fished band. and the external" diameter of` the punch f aux eemauds te the interna! diame-y ter of the fianza-xi hand.. 'A sizing sleeve Buis :alegar-i.' :n riule up and down between the para?. and die 2g, being mountedvon rod` ...Jippie-teit by e. plat/i 3l, whichplate 3i if In turn supported by rods 32 from the wit.,- ill of the* incur. Another sizing sin@ i: rari-ind tint the gate 33 is adapted' :o eeuw the spat@ daim-en the punch 2li anni die Lila' when the gate is lowered. V The nsmgtv finished blank isV placed around the puurlf as shown at it?, and on the first part fi the downward movemenuof the press. ilu plate 3l isr iowered so as to let the einen# sleeve 29 down on the' Support 12T. und. therein. permit the blank 102L to nuwe Courrinto the die 28, Where it is compressi-l between lsaid die and the punch and thr two sizing leeves in substantialb1 the same manner tiert-inbefore described, so as' to pei-hrt it iz shape and bring,l it t0 thc required dimensions.

It will h:- obserif'ed that in both of the mlethods herein described for drawing the bind from a fiat washer-like shape into a cylindrical shape, the blank is drawn continuously from the first mentioned shape to the second through an intermediate'conical shape by the application of pressure which acts always from the same side of the blank or cone. There is, therefore, no necessity of inverting the blank in the die, or otherwise shifting it at an intermediate Stage of the drawing operation, said operation being, in fact, practically instantaneous. The copper or other soft metal usedis of such a :luctile character that, obviously, this operation can be readily carried out While the blank is in a cold state I use'the terms conical and cone.in a broad sense, as the intermediate shape may be only approxi= mately conical. l

It will also be observed thatv in the preferred practice of the invention,` asshown in the drawings, the washer-like blank isof appreciable thickness. It will be noticed from Fig. 1, for example, that, in the specific method illustrated, the maximum diameter of the Washer-like blank is only twenty-four times,approximately, the thickness ofthe metal, although various changes may be made 'in ther dimensions without departingV erable 'variation ispossible ,without departure lfrom the` broad aspects of the inven- I do elaiinlierein the apparatus used in earryna outl lthel y1in vroved method, which is claime illfmy'i app icatonsLerialnNos.

59,840 and 212,470, nor do I claim herein the specific method of making a projectile band or the like which comprises drawing a Washer through a die, as claimed in the last mentioned application.

It will be apparent that I do not limit myself to the employment of a washer in which theu per and lower surfaces are. exactl para] el to each other. While` the was 1er is of considerable thickness z'. e. not of negligible thickness, the thickness is shown as being less than the width of the annular portion, in the approximate proportions previouslyv stated.

I do not claim herein the specific method of sizing the ba id which con'iprises interposing the same between a suitable mandrel and a surrounding die, exerting pressure on the upper and lower edges of the hand to cause it to till the space between the mandrel and die, and then exerting pressure on the band from beneath to eject it from the die,

as claimed in my application, Serial No. j

Various changes in the method herein described may be made without departing from the scope of the invention as defined in the claims.

IVhat I claim is:

1. The method of making a projectile band, which comprises drawing a flat washer of relatively soft. ductile metal into cylindrical shape through a conical form by the application of 'pressure at one side only of the cone.

t?. The method of making a projectile band. which comprises contimlousl;v drawing a flat, readily ductile washer while in a cold state into cylindrical form by the application of pressure at one and the same side of the blank.

3. The method of making a projectile band or the like, which comprises drawing a washer-like bla-nk of ductile metal in a suitable die into a conical shape by means of a punching instrumentality. and continuin@r the drawing action of said instrumentalitv from the larger end of the conical blank, while the latter remains in the die, until the blank assumes a cylindrical shape.

4. The method of making a projcctlle band or the like, which vcom )rises placing a fiat washer-like blank in a ie, and drawing the blank by a punching instrumentalitv i descending into the blank and die, whic instrumentality in the first part of its downward movementdraws the blank into conical shape and then. as the downward movelment is continued, draws the conical blank into a cylinder. j

5. The method of making a projectile band or the like, which comprises forming a flat washer-like blank'ofduetile metal in which the radial distance between the inner and outer peri heries is approximately three times the thic {ness of the metal, and drawing such washer through a conical shape to a cylindrical shape by the application of pressure from one side only of the blank.

6. The method of making a` projectile band or the like, which comprises forming a fiat washer-like blank of ductile metal, the maximum diameter of which is approximately twenty-four times the thickness of the stock, and drawing such washer continuonsly to a cylindrical form through a conical form.

7. The method of making aprojectile band or the like7 which comprises drawing a flat washer in a cylindrical die into cylindrical shape through a conical shape by the continuous application of pressure from one side only of the blank, and then exerting pressure on opposite. edges of the roughly linishedband while said band remains in the same die in which it is so continuously drawn, for perfecting the band and bringing it accurately to size.

8. The method of making a project-ile hand or the like. which comprises forming a Hat washer-like blank of ductile metal, the thickness of which approximates onetwenty-fourth of the maximum diameter, and one-third of the radial distance between the inner and outer peripheries, and then punching such washer in a die from the same side of the washer until the latter assumes a cylindrical shape.

. 9. The method of making a projectile band or the like, which comprises cuttin a flat, washer-like blank of ductile metai placing said blank in a die. and drawing said blank continuously while in a cold state through a conical shape to a cylindrical shape by the application of pressure at one side onl)r of the blank, directed from the larger end of the cone.

10. A method of making metal bands, characterized by the cold punchin of a flat ductile metal washer of considera le thickness from the same side of the washer until the latter presents'V a cylindrical shape.

In witness whereof, I have hereunto set my hand on the' 17 day of Feb., 1917.

ALEXANDER W. LIMONT. 

